A town wharf, with a depth of about 5 feet at its face, and a small-craft launching ramp are at Cotuit.
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Cotuit Bay, northwestward of Cotuit Anchorage, is separated from West Bay by Osterville Grand Island. Cotuit is a village on the west side of the bay. A church spire and two elevated water tanks are prominent. In 1981-2001, a privately dredged channel, with a reported controlling depth of 4 feet, leads from Cotuit Anchorage to off Cotuit Highlands; thence in 2001, a winding channel, with a depth of 6 feet, curves between Sampsons Island and Bluff Point into Cotuit Bay. The channels into Cotuit Bay and North Bay are marked by private seasonal buoys. A reported depth of about 6 feet was in the channel from Cotuit Bay to North Bay in 2005. Seapuit River, south of Osterville Grand Island, connects Cotuit Bay and West Bay. The privately dredged channel in the river had a reported controlling depth of 6 feet in 2004.